Preparation method of zinc electrolytic aluminum negative plate edge bonding strip based on composite coating modification

The invention discloses a preparation method of a zinc electrolytic aluminum negative plate edge bonding strip based on composite coating modification, and the preparation method specifically comprises the following steps: uniformly mixing sodium hexametaphosphate and sodium tungstate, adding triethanolamine, and adjusting the pH value of a solution by adopting KOH to form an electrolytic solution; the method comprises the following steps: polishing and cleaning an aluminum plate, brushing an insulating layer in the middle area, clamping the aluminum plate on a clamp, immersing the aluminum plate in an electrolytic solution for micro-arc oxidation treatment, and cleaning to obtain an aluminum cathode plate with an Al2O3 ceramic coating on the surface; uniformly mixing epoxy resin and a hardening agent, adding nano silicon carbide, and stirring to form a reaction solution; and slowly dripping the reaction liquid on the surface of the Al2O3 ceramic coating of the aluminum cathode plate by using a glass rod, nat